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Side-by-side: what they do, what they cost, what Kai actually thinks. Pass up to 4 tools via ?tools=claude,chatgpt,gemini.
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Dev Platform
Agents
Voice
Video
Audio
Research
Coding
Chatbots
Image
Meetings
Design
Productivity
Writing
Data
Marketing
Education
OpenRouter
S
Runway
S
Replicate
S
Lex
A
TaglineOne API, every model. Pay-as-you-go, no subscriptions.The pro's AI video tool. Gen-4 is the current bar.Run any open-source AI model with an API call.Google Docs with an AI collaborator baked in.
CategoryDev PlatformVideoDev PlatformWriting
PricingPay per token — model-dependentFree + $15-$95/moPay per second of computeFree + $12/mo
Best forDevelopers experimenting across models. Apps that want fallback logic.Marketing video, pitch decks, b-roll, creative shorts.Developers using open-source models (Flux, SDXL, Whisper, etc).Essays, long-form drafts, thinking on the page.
Strengths
  • 300+ models from one endpoint
  • Automatic fallbacks between providers
  • No subscription — just pay what you use
  • Most mature video workflow
  • Character consistency via Act-One
  • Gen-4 quality is production-grade
  • Tens of thousands of models (image, video, audio, LLMs)
  • One-line API for any model
  • Cog framework for custom model deploy
  • Clean writing UX — distraction-free
  • +++ prompt triggers AI help
  • Collaboration + AI feedback together
Weaknesses
  • Slight markup over direct API
  • Some provider features not exposed
  • Expensive at scale
  • Still needs post-editing
  • Cold starts on less-popular models
  • Pricing gets real at scale
  • Less feature-rich than Google Docs
  • AI ceiling below dedicated tools
Kai's verdictS-tier for model-shopping. I use this for every prototype before committing.S-tier. Market leader with reason. Start here for serious video.S-tier for open-source model APIs. The default in this space.A-tier. Beautiful UX. The writing app I'd pick if I only wrote long-form.
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